Syphilis Treatment
Syphilis treatment is straightforward and highly effective: antibiotics, most commonly penicillin, cure the infection at every stage. A single injection of benzathine penicillin G cures primary, secondary, and early latent syphilis, while later stages may require multiple doses. Because syphilis can damage the heart, brain, and other organs when left untreated, starting treatment promptly matters. Treatment stops the infection from progressing, though damage already done in the late stage cannot always be reversed. Follow-up blood tests confirm the infection has cleared. This guide explains how treatment works, what to expect, and why retesting is essential.
How Syphilis Is Treated
Penicillin is the preferred treatment for syphilis in every stage. Early syphilis is cured with a single intramuscular injection of benzathine penicillin G. Latent syphilis of unknown duration usually requires three injections given weekly, and neurosyphilis may need a different penicillin regimen given for longer.
People allergic to penicillin may receive an alternative antibiotic, such as doxycycline, with careful monitoring. Pregnant people with syphilis should be treated with penicillin even if allergic, since it is the only regimen proven to prevent transmission to the baby, using desensitization if needed.
Treatment by Stage
Primary and secondary syphilis are treated with a single penicillin injection. Early latent syphilis, within the first year, is also treated with one injection. Late latent syphilis or latent syphilis of unknown duration needs three weekly injections.
Neurosyphilis, which affects the nervous system, is treated with intravenous penicillin for ten to fourteen days. The stage is determined by symptoms and blood test results, so an accurate diagnosis guides the right regimen.
Follow-Up Testing After Treatment
After treatment, blood tests are repeated at regular intervals to confirm the infection is clearing. For most people, antibody levels, called titers, drop over time and eventually become negative or stable. The CDC recommends follow-up testing at 6 and 12 months for early syphilis and longer monitoring for later stages.
A repeat test may be recommended if titers do not fall as expected, which could indicate reinfection or treatment failure. Staying on schedule with follow-up visits ensures the cure is complete.
Partner Notification and Prevention
Recent sexual partners should be tested and treated even if they have no symptoms, since early syphilis can be transmitted during sex. Partners from the past 90 days are usually treated presumptively. Telling partners is an important part of stopping the spread of syphilis.
Condoms reduce the risk of syphilis but do not cover all skin. Routine testing for sexually active people and screening during pregnancy are the best ways to prevent new infections and their complications.
Completing the full course of antibiotics is essential even if symptoms disappear, because the dose is what actually clears the bacteria from the body. Sexual partners should also be tested and treated to prevent reinfection, and the CDC recommends avoiding sex until the infection is fully treated. After treatment, follow-up blood tests confirm that the infection is cured, and in later stages of the disease, regular monitoring by a clinician ensures a complete recovery over time.
Frequently Asked Questions
Can syphilis be cured?
Yes. Syphilis is completely curable with antibiotics, most commonly penicillin. Early syphilis is cured with a single injection, and later stages may need more doses. Treatment cannot reverse damage already present, so early care is best.
How long does syphilis treatment take?
Early syphilis is cured with a single penicillin injection. Latent syphilis usually requires three weekly injections, and neurosyphilis may need intravenous penicillin for ten to fourteen days. Follow-up blood tests confirm the cure.
Do I need to retest after syphilis treatment?
Yes. Blood tests are repeated at 6 and 12 months and sometimes longer to confirm the infection cleared. Antibody titers should fall after successful treatment. Monitoring catches reinfection or treatment failure early.
Is syphilis treatment safe during pregnancy?
Yes. Penicillin is the recommended treatment for syphilis during pregnancy and is safe for both mother and baby. It is the only regimen proven to prevent passing the infection to the baby, so desensitization is used if needed.
Sources
- CDC. Syphilis treatment guidelines. https://www.cdc.gov/std/treatment-guidelines/syphilis.htm
- CDC. Syphilis fact sheet. https://www.cdc.gov/std/syphilis/stdfact-syphilis.htm
- MedlinePlus. Syphilis. https://medlineplus.gov/syphilis.html
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